Molecular dynamics simulations of the periplasmic ferric-hydroxamate binding protein FhuD.

FhuD is a periplasmic binding protein (PBP) that, under iron-limiting conditions, transports various hydroxamate-type siderophores from the outer membrane receptor (FhuA) to the inner membrane ATP-binding cassette transporter (FhuBC). Unlike many other PBPs, FhuD possesses two independently folded domains that are connected by an alpha-helix rather than two or three central beta-strands. Crystal structures of FhuD with and without bound gallichrome have provided some insight into the mechanism of siderophore binding as well as suggested a potential mechanism for FhuD binding to FhuB. Since the alpha-helix connecting the two domains imposes greater rigidity on the structure relative to the beta-strands in other 'classical' PBPs, these structures reveal no large conformational change upon binding a hydroxamate-type siderophore. Therefore, it is difficult to explain how the inner membrane transporter FhuB can distinguish between ferrichrome-bound and ferrichrome-free FhuD. In the current study, we have employed a 30 ns molecular dynamics simulation of FhuD with its bound siderophore removed to explore the dynamic behavior of FhuD in the substrate-free state. The MD simulation suggests that FhuD is somewhat dynamic with a C-terminal domain closure of 6 degrees upon release of its siderophore. This relatively large motion suggests differences that would allow FhuB to distinguish between ferrichrome-bound and ferrichrome-free FhuD.